Hey guys, im going to Texas for spring break and am bringing some of my guns. I decided to put a sling on my Mossberg 802 plinkster just so i can carry it on my back while on a quad and the like. I broke the gun down for the first time to install the anchors in the stock and noticed an adjustment screw of some sorts. I didnt fuck with it because im not sure what it is. Can anyone tell me? .22 in question I didnt want to register on RFC just to ask that question, but i will if no one can help. Thanks.